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RE: RAID 5/Oracle

From: Christopher Spence <cspence_at_FuelSpot.com>
Date: Wed, 01 Aug 2001 08:28:32 -0700
Message-ID: <F001.0035BFD3.20010801084115@fatcity.com>

About 60% because of the additional reads/writes generated with the parity data.

With 4 disks, I would do 0+1 and use same if you cannot get the additional 8 disks.
If you can afford the additional spindle space loss, performance will greatly appreciate it.

"Do not criticize someone until you walked a mile in their shoes, that way when you criticize them, you are a mile a way and have their shoes."

Christopher R. Spence OCP MCSE MCP A+ RAPTOR CNA Oracle DBA
Phone: (978) 322-5744
Fax: (707) 885-2275

Fuelspot
73 Princeton Street
North, Chelmsford 01863  

-----Original Message-----
Sent: Wednesday, August 01, 2001 11:36 AM To: Multiple recipients of list ORACLE-L

doesn't write performance kind of suck too? KK

-----Original Message-----
Jahnke
Sent: Wednesday, August 01, 2001 10:02 AM To: Multiple recipients of list ORACLE-L

Ravindra Basavaraja schrieb:
>
> We are planning to move our database to Sun 4500 with A1000(RAID
> 5).Our system admin group has been working on this setup and I was
> told that the A1000 which is having 4

disks
> will be seen as just as
> one mount point after configuration.Is this the correct way of
> confuguration.Don't we see each disk of A1000 as different mount
> point.
>
> Thanks
> Ravindra
>

Hi,

if you setup a group of disks as a RAID5 disk array, they appear as one logical unit. Hence, you only see one single mount point. Advantages: Read access is usually faster, since the data is transparantly distributed to your disks by the RAID system. It's another step towards higher availability since RAID5 usually gives you the feature of replacing a damaged disk while the file system keeps operating.
Disadvantage: You don't have that much control over the degree of fragmentation since the data distribution is done by the RAID system.


| Regards,                   |
| Stefan Jahnke              |

| @:D2 Vodafone, Abt.: FBOM |
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Received on Wed Aug 01 2001 - 10:28:32 CDT

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